Steam-boiler



(No Model.)

T. G. HALL.

STEAM BOILER. i No. 331,495. Patented Dec. 1, 1885.

Nv PETERS. Pwlmumcgnplm, wamingwn, at;

NITED STATESv PATENT Unsinn.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 331,495, dated December 1, 1885.

Application filed April 10, 1883. Serial No. 91,253. (No model.)

To all whom t may concern.-

Be it known that I, THURsTEN G. HALL, of Niagara Falls, in the county of Niagara and State of New York, have invented new and useful Improvements in Steam-Boilers, of which the following is a speciiication.

The object of this invention is to construct a steam-boiler which is adapted to generate steam under very high pressure5and the invention consists of the peculiar construction of the boiler, which will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure l is a sectional elevation of my improved steamboiler. Fig. 2 is a vertical cross-section of the same. Fig. 3 is a detached elevation of the heating-coil. Fig. 4 is an end elevation of the heating-coil on an enlarged scale.

Like letters of reference refer to like parts in the several gures.

A represents the cylindrical shell of the boiler, and B thesteam-dome secured thereto. Both of these parts may be constructed of wrought or cast iron, as may be preferred, and are made of the proper strength to safely carry the pressure which the boiler is designed to sustain.

C and O represent the heads which close the ends of the shell A, and which are secured to the latter by bolts c or other suitable means.

D represents the heating-coil, which is arranged in the shell A, and which extends with one end, d, outwardly through the head C. The opposite end, d', of the coil D extends through the head C and leads to the chimney or other outlet for the products of combustion.

e represents a sleeve or cylindrical jacket, which surrounds the end portion, d, of the coil, and is tightly secured to the same outside of the boiler beyond the point at which the combustion takes place in the coil. Theinner end of the sleeve or jacket e opens into the water-space of the shell A, so that the sleeve is always iilled with water, and ,thereby pre` vents the end portion, d, of the coil from be coming overheated.

f represents a stuffing-box arranged in the head C and forming a steam-tight seat for the sleeve e, in which the latter can move length wise as the coil D expands or contracts in becoming heated or cooled.

g represents a tuyere through which combustible gas is delivered into the end d of the coil D, and 7L is an annular passage be tween the tuyere and the inner side of the coil, through which air is drawn into the coil by the gas-jet. A separate tuyere through which a current of air is forced into the coil may, however, be employed, if desired. The` coil D extends back and forth in the shell A, and its opposite end, d', is provided with a water-jacket, t', seated in a stufiing-box, 7c, in the head C, which parts are similar in con struction to the corresponding parts surrounding the end d of the coil. The waterjacket i extends to the chimney or to a distance from the iire at which the heat has been sufciently abstracted from the coil to render overheating or burning of the same impossible. The coil D is made of such dimensions as to insure the proper heating of the water and the desired generation of steam in the shell A. The gas is ignited at the point where it issues from the tuyere into the coil D, and, as the latter is entirely surrounded by water, the intense heat generated by the combustion of the gas in the coil is fully utilized in making steam, and the destruction of the coil by the intense heat is avoided. The shell and dome are covered with a suitable non-conductor of heat to prevent radiation.

I claim as my invention l. In a steamlboiler, the combination, with ashell, A,of aheating-coil, D, arranged lengthwise in said shell,stufngboxes arranged in the heads of the shell in which the ends of the coil are supported, a gas-tuyere, g, and an air-supply passage, h, opening into the coil, substantially as setforth.

2. In a steam-boiler, the combination, with a shell, A, of a'heating-coil, D, arranged lengthwise in the shell and stuffing-boxes arranged in the heads of the shell in which the ends of the coil are supported, substantially as set forth.

3. In a steam-boiler, the combination, with the shell A, of the heating-coil D, sleeve e, and stufngbox f, substantially as set forth.

T. G. HALL.

Witnesses:

JNo. J. BONNER, Claras. F. GEYER.

IOO 

